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There is no SEO bias towards any major tld, such as the ones you mentioned. The only thing you need to take into consideration here is which tld is best suited by definition - .co.uk for a site that is for a UK audience, .org.uk for an organization in the uk or .com for an international website. I would personally go with .com as it allows you to expand internationally in the future (you mentioned you might), it's arguably the easiest to remember/one most people are familiar with.

You're absolutely correct in redirecting each extension back to your chosen one (a 301 redirect in your .htaccess would be the way to go).

Also, add each site to your bing/google webmaster tools and configure accordingly. :-)